Research article

Increased incidence of autoimmune markers in patients with combined pulmonary fibrosis and emphysema

Argyris Tzouvelekis, George Zacharis, Anastasia Oikonomou, Dimitrios Mikroulis, George Margaritopoulos, Anastasios Koutsopoulos, Antonis Antoniadis, Andreas Koulelidis, Paschalis Steiropoulos, Panagiotis Boglou, Matina Bakali,Marios Froudarakis and Demosthenes Bouros

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BMC Pulmonary Medicine 2013, 13:31 doi:10.1186/1471-2466-13-31

Published: 22 May 2013

Abstract (provisional)

Background

Combined pulmonary fibrosis and emphysema (CPFE) is an umbrella term encompassing upper lobe emphysema and lower lobe pulmonary fibrosis with pathogenesis elusive. The aim of our study was to investigate the incidence of autoimmune markers in patients with CPFE.

Methods

In this multicenter study we retrospectively evaluated records from patients with CPFE and IPF without emphysema. Baseline demographic characteristics, high-resolution computed tomography (HRCT), spirometry, histopathological, treatment, serum immunologic and survival data were investigated. B cell presence was estimated with CD20 immunostaining in representative lung biopsy samples from CPFE patients and control subjects.

Results

A statistically significant increased number of CPFE patients with elevated serum ANA with or without positive p-ANCA titers compared to patients with IPF without emphysema was observed. Patients with CPFE and positive autoimmune markers exhibited improved survival compared to patients with a negative autoimmune profile. A massive infiltration of clusters of CD20+ B cells forming lymphoid follicles within the fibrotic lung in CPFE patients with positive serum immunologic profile compared to patients with negative profile, was noted and positively correlated with improved survival.

Conclusions

A significant proportion of patients with CPFE may present with underlying auto-immune disorders that may reside insidiously and be associated with favorable prognosis. Early identification of these patients using a panel of auto-antibodies may lead to more targeted and effective therapeutic applications.

The complete article is available as a provisional PDF. The fully formatted PDF and HTML versions are in production.